Khlong Hat (Thai: คลองหาด, pronounced [kʰlɔ̄ːŋ hàːt]) is the southeasternmost district (amphoe) of Sa Kaeo province, eastern Thailand.

The area originally was a forest with plenty of Mahat (Thai: มะหาด) or Lakooch tree (Artocarpus lakoocha) along the canals (khlong).

In 1984 Cambodian refugees fleeing from the civil war migrated to the area of Khlong Hat.

The Thai government separated the four sub-districts Khlong Hat, Thai Udom, Sap Makrut, and Sai Diao from Watthana Nakhon district and created a minor district (king amphoe) for better administration, effective 15 January 1985.

A border crossing into Cambodia is in the eastern part of the district near the village of Ban Khao Din.